First lady Michelle Obama worked out with trainers from "The Biggest Loser" at the White House as part of her national Let's Move! initiative. Take a look at other Presidential first ladies and the causes they have supported.

Obama held a grassroots rally at Southport Park on Monday evening. Supporters with tickets to the event were welcome to attend starting at 3 p.m.

The first lady spoke at 6:30 p.m. about strides made over the last four years.

Pop star Ricky Martin spoke ahead of her.

Michelle Obama also visited Florida last week and spoke in Daytona Beach, Jacksonville and Miami.

GOP presidential nominee Mitt Romney also campaigned in the area Monday morning, speaking at the Sanford airport.

Polls between Romney and President Barack Obama are close, and both sides are still vying for the Sunshine State. That's true for most other swing states, where most national polls give Obama only a slight edge.

Polls open in Florida at 7 a.m. on Tuesday.

Images: Michelle Obama

Michelle Obama's most memorable outfits

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Michelle Obama wears Jason Wu gown

Michelle Obama drew praise for her Jason Wu-designed inaugural ball gown in January 2013. The gown was made from chiffon and velvet, according to details released by the White House, and had design parallels to the flowing white chiffon dress she donned in 2009, also designed by Wu.